9 Status Registers & Result Codes

S-Register Descriptions

In most bit-mapped S-registers, the default bit value is 0. Non-0 default values are followed by an asterisk. In some cases, default values are shown in the reference column preceded by +. Some bits are reserved for factory use and should not be changed.

Basic S-Registers "ATSn=x"

Command

Function & Description

+Ref.

S0=

Set the number of rings on which the modem

+000

 

will answer. 0 value disable auto-answer

 

S1=

Counts and stores number of rings from an

+000

 

incoming call

 

S2=

Define escape code character, default ‘+’ (43

+043

 

dec.). A value of 128-255 disables the escape

 

 

code

 

S3=

Define ASCII Carriage Return

+013

S4=

Define ASCII Line Feed

+010

S5=

Define ASCII Backspace. A value of 128-255

+008

 

disables the Backspace key’s delete function

 

S6=

Set the number of seconds the modem waits

+003

 

before dialing if ‘X0’ or ‘X1’ is selected. If a

 

 

setting of ‘X2’ to ‘X7’ is selected, the modem

 

 

will dial as soon as it detects a dial tone. This

 

Status Registers & Result Codes 105

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ZyXEL Communications U-336SA user manual Status Registers & Result Codes, Register Descriptions, Basic S-Registers ATSn=x

U-336S, U-336SA specifications

ZyXEL Communications, a leading global provider of networking and cybersecurity solutions, has offered a range of products designed to cater to various connectivity needs. Among these, the U-336SA and U-336S modems stand out for their reliability and performance, particularly in the dial-up category during the heyday of internet access.

The U-336SA and U-336S modems are external devices that revolutionized the way users connected to the internet in the late 1990s and early 2000s. Designed for both home users and small businesses, these modems supported 33.6 Kbps data transfer rates, which, at the time, were considered cutting-edge. This capability allowed for reasonably swift internet browsing, email communication, and file downloads compared to earlier modems.

One notable feature of both the U-336SA and U-336S models is their plug-and-play functionality. This ease of use made them accessible to even the less tech-savvy users, allowing quick and straightforward installation. Users could connect the modems to their PCs or laptops via a standard serial interface, minimizing setup time and complexity.

Additionally, both modems were equipped with error correction and data compression technologies. The V.42 and V.42bis protocols enhanced data integrity during transmission, ensuring that users experienced fewer disruptions and greater reliability in their connecting experience. This was particularly vital for tasks like file transfers and large downloads, where data integrity was paramount.

The modems also featured compatibility with various operating systems, including early versions of Windows, which expanded their appeal to a broader audience. The U-336SA was specifically engineered as a standalone device, while the U-336S could often be used with existing computer systems, showcasing versatility in various deployment scenarios.

In terms of design, both modems were compact and lightweight, allowing for easy portability. This made them suitable for users who required connectivity on the go or in different locations.

Ultimately, the ZyXEL U-336SA and U-336S modems represent a significant technological achievement in the history of internet connectivity. Their introduction set the stage for subsequent advancements in modem technology and played a crucial role in the evolution towards broadband and high-speed internet access that we enjoy today. Their legacy endures in the foundational technologies and protocols that continue to drive modern telecommunications.